RECEPTACLE ASSEMBLY, CAGE, AND MOUNTING METHOD

An embodiment includes: a connector 200, 300 configured to allow a module substrate 21 of a pluggable module 20 to be inserted to the connector along an insertion-extraction direction Die and configured to be electrically connected to the module substrate 21; a cage 400, 500 having a cage body 410, 510 configured to accommodate the connector 200, 300 and defines a space in which the pluggable module 20 is guided and inserted along the insertion-extraction direction Die. The connector 200, 300 and the cage body 410, 510 are mounted on a substrate 100 such that the insertion-extraction direction Die is substantially orthogonal to the front side 101 of the substrate 100, and a fixing part 416b, 516b, 416d, 516d for fixing the cage body 410, 510 to the substrate 100 is provided at a rear end edge 416, 516 of the cage body 410, 510 located on the substrate 100 side when mounted on the substrate 100.